Need NFHS Ruling

[varefump]

We had our first new member training class today and the following play came up. There was a lengthy discussion but no final approved ruling provided. With the new interference interpretation where intent is no longer a part of the equation, many felt that this play was not allowed.

Play: R2 on second, one out. Base hit to outfield. R2 rounds but misses 3rd base. Proceeds to a touches Home. Third base coach knows she missed 3rd and hollars for her to return. R2 retouches home on her way back to 3rd where she arrives safely.

Is this a legal play. Our lead trainer says that since R2 is a retired runner (by definition), she would be causing interference by drawing a throw when she returned to 3rd and therefore B1 (closest to home) would be declared out.

I feel that the definition of a retired runner should say "a runner who has legally scored..". Since R2 has not legally scored, she is allowed to retrace her steps the same as if she had missed 2nd base on the way to 3rd.

Please provide proper ruling and cite rule references.

Thanks.